<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script crossorigin src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
    <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
    <!-- 生产环境中不建议使用 jsx babel转译库 将jsx转化为原生js -->
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
</head>
</head>
<body>
    <div id="example"></div>
        <script type="text/babel">
            class Counter extends React.Component{
                constructor(props){
                    super(props);
                    this.state={clickCount:0};
                    this.handleClick=this.handleClick.bind(this);
                }
                handleClick(){
                    this.setState(function(state){
                        return {clickCount:state.clickCount + 1};
                    });
                }
                render(){
                    return (
                        <h2 onClick={this.handleClick}>点击! 点击次数为:{this.state.clickCount}</h2>
                    )
                }
            }
            ReactDOM.render(
                <Counter/>,
                document.getElementById('example')
            )
        </script>
</body>
</html>